On ARM kernels build with EABI we see the following failures:

Running /root/systemtap/testsuite/systemtap.context/context.exp ...
FAIL: int64 function arguments -- numeric
FAIL: int64 function arguments -- numeric --kelf --ignore-dwarf

This is because these tests pass 'long long' arguments.
It seems this differs between ARM calling conventions, newer calling conventions mandate: "64-bit function parameters passed in registers are aligned to an even-numbered register instead of using the next available pair."

This could be fixed by taking this into account in tapset/arm/registers.stp u/s64_arg. But that would break other arm calling conventions.

(Also this would move some of the arguments out of registers and onto the stack, which arm/registers.stp arch functions aren't yet prepared to handle.)